diff --git a/CMakeLists.txt b/CMakeLists.txt
index 86ec204..2db8d4f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -10,6 +10,7 @@ set(PACKAGE_NAME           "LibVNCServer")
 set(FULL_PACKAGE_NAME      "LibVNCServer")
 set(PACKAGE_VERSION        "0.9.8")
 set(PROJECT_BUGREPORT_PATH "http://sourceforge.net/projects/libvncserver")
+set(CMAKE_C_FLAGS "-O2 -W -Wall -g")
 
 include_directories(${CMAKE_SOURCE_DIR} ${CMAKE_BINARY_DIR} ${CMAKE_SOURCE_DIR}/libvncserver ${CMAKE_SOURCE_DIR}/common)